Relay device



July 4; 1939. A. G. KERSHAW RELAY DEVICE Filed Sept. 10, 1937 2Sheets-Sheet I INVENTOR Arthur Greezzw elwlzaw ATTORNEY HIS July 4,1939. A. G. KERSHAW RELAY DEVICE Filed Sept. 10, 1937 2 Sheets-Sheet 2INV ENTOR v Arthur Green lzewbaw.

HIS ATTORNEY Patented July 4, 1939 UNITED STATES PATENT OFFICE RELAYDEVICE Application September 10, 1937, Serial No. 163,284 In GreatBritain January 7, 1937 3 Claims.

This invention relates to relay devices and the like of the kind inwhich the contacts of the device are arranged to be connected to theexternal circuits controlling the operation of the relay 5 device andcontrolled thereby by means of a detachable terminal board or boards,the terminals of which are connected to the external circuits, theinvention having for its object to provide improved arrangements of thischaracter.

According to the invention the terminal board or boards is or arearranged to be pivotally mounted on the frame or support carrying therelay device in such a manner that by rotating the terminal board aboutits pivot the contacts carried thereby and connected to the externalcircuit terminals are moved out of engagement with the correspondingcontacts carried upon the frame or support and connected to the relaycontacts thereby enabling the relay device to be removed and replaced.

In order that the invention may be readily understood it will now bedescribed, by way of example only, with reference to the accompanyingdrawings in which:

Figure 1 is a partly sectional side elevational view and Figure 2 a planview from below illustrating the invention as applied to one form ofrelay device, the figures being partly broken away. Figure 3 is asectional view on the line II-II of Figure 1.

Referring to the drawings, the reference character I designates a framewhich supports a relay device, which relay device may for example besimilar to that shown and described in the copending application forLetters Patent of the United States, Serial No. 151,878, filed by myselfand another on July 3, 1937 for Electrically operated switch mechanism.This frame is provided at one end thereof with a number of projectinglugs 2 carried by a member 3 suitably secured to the frame I, each ofthese lugs 2 being provided with a transverse pivot pin 4 serving tocouple the forked end 5 of a bar 6 carrying a terminal board 1 to thelug 2. The opposite end 8 of each of these bars 6 is arranged to fitwithin a pair of corresponding lugs 9 carried by the base H) of therelay device, each pair of lugs 9 being provided with a removabletransverse pin H for securing the end 8 of the bar 6 in position in thelugs 9. The ends 8 of the bars 6 are provided with suitable handles l2and the terminals l3 on the boards 1 carried by the bars 6 areelectrically connected to contacts l4 (Figure 3) which, when the bars 6are in the positions above described, engage with corresponding contactsprings l5 mounted on the base l and connected to the fixed relaycontacts Hi.

It will be understood that by withdrawing the pins II from the pairs oflugs 9, the bars 6 can be rotated around the pivot pins 4 by means ofthe handles l2 so as to withdraw the contacts M on the terminal boards Ifrom the contact springs I5 on the base l0 so that the relay device isthen disconnected from the external circuits and can be removed andreplaced by another relay device.

The invention is evidently not limited to the particular constructionabove described by way of example which may be modified in variousrespects without exceeding the scope of the invention.

Having now particularly described and ascertained the nature of my saidinvention and in what manner the same is to be performed, I declare thatwhat I claim is:

1. In combination, a frame which supports a device having contactsmounted thereon, a plurality of terminal boards pivotally attached atone end to said frame for individual swinging movement toward and awayfrom the contacts of said device, and contacts mounted on each terminalboard in such positions that they will become engaged with or disengagedfrom associated ones of said first mentioned contacts according as theterminal board is swung toward or way from said frame.

2. In combination, a frame which supports a relay device having a baseprovided with contacts connected to the relay contacts and with a pairof spaced lugs, a bar having a forked end and coupled at one end bymeans of a transverse pivot pin to a lug carried by said frame andadapted at the other end to fit between the lugs of said pair, aterminal board secured to said bar and provided with contacts whichengage the contacts on said base when said bar is between the lugs ofsaid pair, a removable pin mounted in said pair of lugs for securingsaid bar in the position in which it is between said lugs, and a handlesecured to said bar at the end which cooperates with said pair of lugs.

3. In combination, a frame which supports a device having a baseprovided with contacts and with a pair of spaced lugs, a bar having aforked end and coupled at one end by means of a transverse pivot pin toa lug carried by said frame and adapted at the other end to fit betweenthe lugs of said pair, a terminal board secured to said bar and providedwith contacts which engage the contacts on said base when said bar isbetween the lugs of said pair, a removable pin mounted in said pair oflugs for securing said bar in the position in which it is between saidlugs, and a handle secured to said bar at the end which cooperates withsaid pair of lugs.

ARTHUR GREENWOOD KERSHAW.

